The multiplication property of equality could be used to solve which of the following equations? -3 + y = 7
b ÷ (-2) = 18
(x + 2)(x - 3) = 0
m + 7 = -12

How many sides does a regular polygon have if each exterior angle measures 72a.3b.4c.5d.6

The center of a circle represent by the equation (x+9)^2+(y-6)^2=10^2 (-9,6), (-6,9), (6,-9) ,(9,-6)

Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?